Cooling system of explosion-proof diesel engine

Abstract

The anti-explosion diesel engine cooling system comprises a water cooling pipe, a heat exchanger, a water pump and a radiator, the water cooling pipe is provided with an inner air channel and an outer water channel, an inlet of the inner air channel is communicated with an exhaust pipe of a diesel engine, and the outer water channel is coaxially arranged on the outer side of the inner air channel in a sleeving mode; an air inlet of the heat exchanger is communicated with an outlet of the inner air passage; a first outlet of the water pump is communicated with a water inlet of the heat exchanger, and a second outlet of the water pump is communicated with an inlet of the outer water channel; the water inlet of the outer water channel is communicated with the water inlet of the heat exchanger, the outlet of the outer water channel is communicated with the inlet of the radiator, the water outlet of the heat exchanger is communicated with the inlet of the radiator, and the outlet of the radiator is communicated with the inlet of the water pump. The cooling liquid does not need to be continuously supplemented, the operation cost is greatly reduced, and environmental pollution caused by emission is avoided.

Description

Technical Field

[0001] The present invention relates to the field of offshore drilling platform power equipment, and in particular to an explosion-proof diesel engine cooling system. Background Art

[0002] High-power, explosion-proof diesel engines are essential power equipment in the oil and mining industries. Excessively high surface and exhaust temperatures during operation can pose a safety hazard. Exhaust treatment systems typically employ a wet, open-type design, where exhaust gas comes into direct contact with cooling water. Exhaust gas containing large amounts of cooling water pollutes the offshore environment, and a continuous cooling water supply is required. Offshore platforms struggle to meet this demand, limiting the application and development of explosion-proof diesel engines in these scenarios.

[0003] The Chinese invention with announcement number CN108194170A proposes an engine exhaust cooling device, including an exhaust pipe, an expansion chamber on the right side of the exhaust pipe, a mixing chamber on the right side of the expansion chamber, a mist chamber provided on the outside of the mixing chamber, a microelectronic atomization device and a liquid storage tank provided on the outside of the mist chamber, a vent provided on the outer wall of the mixing chamber, an ejector pipe provided on the right side of the mixing chamber, the ejector pipe is connected to the rear expansion chamber through a flange, the exhaust gas enters the expansion chamber through the exhaust pipe, the exhaust gas flow rate slows down after passing through the expansion chamber, coolant is added to the liquid storage tank, the coolant is atomized by the microelectronic atomization device and enters the mist chamber, the exhaust gas flows in the mixing chamber, because the exhaust gas flow rate is fast, the air pressure in the mixing chamber is lower than the atmospheric pressure, under the action of atmospheric pressure, the mist in the atomization chamber enters the mixing chamber through the vent and mixes with the automobile exhaust gas, the mixed automobile exhaust gas is ejected into the rear expansion chamber through the ejector pipe, during the injection process, the exhaust gas flow rate is accelerated due to the action of the ejector pipe, the atomized coolant vaporizes and absorbs heat after mixing with the exhaust gas, thereby reducing the temperature of the exhaust gas.

[0004] Regarding the above-mentioned related technologies, there are the following defects: in the mixing chamber, the exhaust gas directly contacts the atomized coolant, thereby achieving the purpose of cooling. However, the atomized coolant will be discharged along with the exhaust gas, and the coolant needs to be continuously replenished, which is not only costly, but the discharged coolant will also cause certain pollution to the environment. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose an explosion-proof diesel engine cooling system to solve the technical problem in the prior art that atomized coolant is discharged with the exhaust gas.

[0006] To achieve the above technical objectives, the technical solution of the present invention provides an explosion-proof diesel engine cooling system, comprising a water cooling pipe, wherein the water cooling pipe is provided with an inner air channel and an outer water channel, wherein the inlet of the inner air channel is connected to the exhaust pipe of the diesel engine, and the outer water channel is coaxially sleeved on the outer side of the inner air channel; a heat exchanger, wherein an air inlet of the heat exchanger is connected to an outlet of the inner air duct; a water pump, wherein a first outlet of the water pump is connected to the water inlet of the heat exchanger, and a second outlet of the water pump is connected to the inlet of the external water channel; and The radiator, the outlet of the external water channel is connected to the inlet of the radiator, the water outlet of the heat exchanger is connected to the inlet of the radiator, and the outlet of the radiator is connected to the inlet of the water pump.

[0007] In some embodiments, the water-cooling pipe further comprises a double-layered corrugated pipe, the double-layered corrugated pipe is located in the middle of the water-cooling pipe, both ends of the double-layered corrugated pipe are connected to the water-cooling pipe, and the double-layered corrugated pipe is used to reduce the vibration transmission of the diesel engine.

[0008] In some embodiments, the length of the double-layer corrugated tube is greater than or equal to 200 mm.

[0009] In some embodiments, the water cooling pipe further includes a reducer, an inlet of the reducer is connected to the exhaust pipe of the diesel engine, and an outlet of the reducer is connected to the inlet of the water cooling pipe.

[0010] In some embodiments, the heat exchanger further includes a flame arrester installed on the air outlet of the heat exchanger.

[0011] In some embodiments, the radiator includes a frame, a motor, a fan and a heat dissipation water tank. The motor and the heat dissipation water tank are both installed on the frame. The fan is installed on the output shaft of the motor. The fan faces the heat dissipation water tank. The outlet of the external water channel is connected to the inlet of the heat dissipation water tank, and the outlet of the heat dissipation water tank is connected to the inlet of the water pump.

[0012] In some embodiments, the cooling system also includes a temperature monitoring mechanism, which includes a controller and an exhaust temperature sensor. The exhaust temperature sensor is installed on the air outlet of the heat exchanger, and the controller is electrically connected to the exhaust temperature sensor, water pump and fan at the same time.

[0013] In some embodiments, the heat dissipation water tank includes a water tank body, a water injection pipe and a filter assembly, the water injection pipe is connected to the water tank body, the filter assembly is arranged on the water injection pipe, and the filter assembly is used to filter impurities in the coolant to be added to the water tank body.

[0014] In some embodiments, the filter assembly includes a pump body, a water suction pipe, a filter ball and a hose. The inlet of the water suction pipe extends into the seawater, the filter ball floats in the water suction pipe, the outlet of the filter ball is connected to the inlet of the hose, the outlet of the hose is connected to the inlet of the pump body, and the outlet of the pump body is connected to the inlet of the water injection pipe.

[0015] In some embodiments, the filter assembly also includes multiple mudguards and scrapers, the multiple mudguards are arranged at intervals along the height direction of the water suction pipe, the mudguards are tilted upward, the filter balls are located between the multiple baffles, and the multiple scrapers are arranged in sequence along the length direction of the mudguards.

[0016] Compared with the existing technology, the beneficial effects of the present invention include: the coolant circulates in the closed water-cooling pipes, heat exchangers, water pumps, and radiators, and is not discharged with the exhaust gas. There is no need to continuously replenish the coolant, which greatly reduces operating costs and avoids external discharge to pollute the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the cooling system provided by the present invention; Figure 2 Schematic diagram of the flow of exhaust gas and coolant in the cooling system provided by the present invention; Figure 3 This is a schematic diagram of the overall structure of the water-cooling tube provided by the present invention; Figure 4 This is a partial structural cross-sectional view of the water-cooling pipe provided by the present invention; Figure 5 This is a cross-sectional view of the overall structure of the radiator provided by the present invention; Figure 6 This is a cross-sectional view of the overall structure of the heat exchanger provided by the present invention; Figure 7 It is a cross-sectional view of the overall structure of the filter assembly provided by the present invention.

[0018] Description of reference numerals: 1. Water-cooling pipe; 11. Inner air channel; 12. Outer water channel; 13. Double-layer bellows; 14. Reducer; 2. Diesel engine; 21. Exhaust pipe; 3. Heat exchanger; 31. Air inlet; 32. Water inlet; 33. Water outlet; 34. Flame arrester; 35. Air outlet; 4. Water pump; 41. First outlet; 42. Second outlet; 5. Radiator; 51. Frame; 52. Motor; 53. Fan; 54. Radiator water tank; 55. Water tank body; 56. Water filling pipe; 57. Filter assembly; 571. Pump body; 572. Suction pipe; 573. Filter ball; 574. Hose; 575. Fender; 576. Scraping gear. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The present invention provides an explosion-proof diesel engine cooling system, the structure of which is as follows: Figure 1 - Figure 7 As shown, it includes a water cooling pipe 1, a heat exchanger 3, a water pump 4 and a radiator 5.

[0021] The water cooling pipe 1 is provided with an inner air channel 11 and an outer water channel 12 . The inlet of the inner air channel 11 is connected to the exhaust pipe 21 of the diesel engine 2 . The outer water channel 12 is coaxially sleeved on the outer side of the inner air channel 11 .

[0022] The air inlet 31 of the heat exchanger 3 is communicated with the outlet of the inner air passage 11 .

[0023] The first outlet 41 of the water pump 4 is connected to the water inlet 32 ​​of the heat exchanger 3 , and the second outlet 42 of the water pump 4 is connected to the inlet of the external water channel 12 .

[0024] The outlet of the external water channel 12 is connected to the inlet of the radiator 5 , the water outlet 33 of the heat exchanger 3 is connected to the inlet of the radiator 5 , and the outlet of the radiator 5 is connected to the inlet of the water pump 4 .

[0025] During use, the water pump 4 acts as a power source, driving the coolant to split: one portion enters the heat exchanger 3 through the water inlet 32 ​​of the heat exchanger 3, and the other portion enters the external water channel 12 of the water-cooling tube 1 through the inlet of the external water channel 12. After the coolant in the external water channel 12 completes the initial cooling of the exhaust gas, it flows to the radiator 5; after the coolant in the heat exchanger 3 absorbs the heat of the exhaust gas, it also flows to the radiator 5. The radiator 5 dissipates the heat and cools the heated coolant, and the cooled coolant flows back to the inlet of the water pump 4, completing the cycle. The exhaust gas from the diesel engine 2 first enters the internal air channel 11 of the water-cooling tube 1. The coolant in the external water channel 12 exchanges heat with the exhaust gas in the internal air channel 11 to achieve initial cooling. After the initial cooling, the exhaust gas enters the heat exchanger 3 and undergoes a secondary heat exchange with the coolant in the heat exchanger 3. Finally, the cooled exhaust gas is discharged, and the coolant remains in the system for circulation.

[0026] In the present invention, the coolant circulates in the closed water-cooling pipe 1, heat exchanger 3, water pump 4, and radiator 5, and is not discharged with the exhaust gas. There is no need to continuously replenish the coolant, which greatly reduces operating costs and avoids external discharge to pollute the environment.

[0027] To slow down the vibration transmission of diesel engine 2, please refer to Figure 3 In a preferred embodiment, the water-cooling pipe 1 also includes a double-layer bellows 13, which is located in the middle of the water-cooling pipe 1. Both ends of the double-layer bellows 13 are connected to the water-cooling pipe 1, and the double-layer bellows 13 is used to slow down the vibration conduction of the diesel engine 2.

[0028] During use, the double-layered bellows 13 exhibits excellent elasticity and flexibility, and its corrugated structure elastically deforms when the diesel engine 2 vibrates during operation. When vibrations are transmitted from the diesel engine 2 to the water-cooling pipe 1, the double-layered bellows 13 absorbs and dissipates the vibration energy through its own expansion and contraction, reducing the vibration amplitude and preventing direct transmission of vibration to components such as the heat exchanger 3 and water pump 4, thereby minimizing the risk of equipment resonance and damage caused by vibration.

[0029] To improve the cushioning effect of the double-layer bellows 13, please refer to Figure 3 In a preferred embodiment, the length of the double-layer corrugated tube 13 is greater than or equal to 200 mm.

[0030] When in use, the longer bellows can be regarded as a "multi-stage buffer unit". The vibration energy is gradually consumed during the transmission along the bellows, avoiding local stress concentration.

[0031] To make the exhaust flow more stable, please refer to Figure 4 In a preferred embodiment, the water-cooling pipe 1 further includes a reducer 14 , the inlet of the reducer 14 is connected to the exhaust pipe 21 of the diesel engine 2 , and the outlet of the reducer 14 is connected to the inlet of the water-cooling pipe 1 .

[0032] During use, the exhaust pipe 21 of the diesel engine 2 differs in diameter from the water-cooling pipe 1. The reducer 14, with its smoothly transitioning conical surface, ensures smooth flow of exhaust gas from the exhaust pipe 21 to the water-cooling pipe 1. When the exhaust gas flows from the smaller-diameter exhaust pipe 21 into the larger-diameter water-cooling pipe 1, the reducer 14 prevents eddies and turbulence caused by the sudden change in pipe diameter.

[0033] To improve security, please refer to Figure 1 In a preferred embodiment, the heat exchanger 3 further includes a flame arrester 34 , which is installed on the air outlet 35 of the heat exchanger 3 .

[0034] During operation, the exhaust of the explosion-proof diesel engine 2 may contain sparks or flames due to incomplete combustion. A flame arrester 34, mounted at the outlet 35 of the heat exchanger 3, divides the flame into numerous small flame streams. Through heat dissipation and quenching, it quickly absorbs the flame energy and prevents the flame from propagating through the outlet 35 into the external flammable and explosive environment.

[0035] To cool the coolant, refer to Figure 5In a preferred embodiment, the radiator 5 includes a frame 51, a motor 52, a fan 53 and a heat dissipation water tank 54. The motor 52 and the heat dissipation water tank 54 are both installed on the frame 51. The fan 53 is installed on the output shaft of the motor 52. The fan 53 faces the heat dissipation water tank 54. The outlet of the external water channel 12 is connected to the inlet of the heat dissipation water tank 54, and the outlet of the heat dissipation water tank 54 is connected to the inlet of the water pump 4.

[0036] During operation, the water pump 4, the power source of the cooling system, transports the coolant, heated by the water-cooling pipes 1 and heat exchanger 3, through the external water channel 12 to the inlet of the radiator 54. As the coolant absorbs exhaust heat in the water-cooling pipes 1 and heat exchanger 3, its temperature rises significantly, requiring cooling by the radiator 5. The heated coolant then flows into the inlet of the radiator 54, flows through the heat pipes or fins, and transfers its heat to the pipe or fin walls. When the motor 52 is energized, its output shaft drives the fan 53 to rotate at high speed. The fan 53, directed toward the radiator 54, generates a powerful airflow as it rotates, rapidly removing the heated air from the surface of the radiator 54 while simultaneously drawing in cooler air from the surrounding area. This forced convection accelerates heat exchange between the radiator 54 and the air. After sufficient heat exchange between the radiator 54 and the air, the coolant temperature decreases, achieving its cooling purpose. The cooled coolant then flows out of the outlet of the radiator 54 and returns to the inlet of the water pump 4.

[0037] To monitor the exhaust gas temperature, refer to Figure 5 In a preferred embodiment, the cooling system also includes a temperature monitoring mechanism, which includes a controller and an exhaust temperature sensor. The exhaust temperature sensor is installed on the air outlet 35 of the heat exchanger 3, and the controller is electrically connected to the exhaust temperature sensor, the water pump 4 and the fan 53 at the same time.

[0038] During use, the exhaust temperature sensor is installed at the outlet 35 of the heat exchanger 3, directly contacting the exhaust gas. When the exhaust gas passes through the outlet 35, the temperature sensing element inside the sensor generates a corresponding electrical signal as the exhaust gas temperature changes. The exhaust temperature sensor transmits the collected electrical signal to the controller via a cable. The controller calculates the actual exhaust gas temperature value and dynamically adjusts parameters such as the fan 53 speed and coolant flow rate based on the temperature data to ensure that the temperature at the outlet 35 of the heat exchanger 3 is always within a safe range, avoiding equipment damage or explosion risks caused by excessive temperatures, and preventing energy waste caused by excessive cooling.

[0039] To improve the cleanliness of seawater coolant, please refer to Figure 7In a preferred embodiment, the heat dissipation water tank 54 includes a water tank body 55, a water injection pipe 56 and a filter assembly 57. The water injection pipe 56 is connected to the water tank body 55, and the filter assembly 57 is arranged on the water injection pipe 56. The filter assembly 57 is used to filter impurities in the coolant to be added to the water tank body 55.

[0040] When in use, the filter assembly 57 is typically a mesh-type structure and is installed in series with the water injection pipe 56. When the operator adds coolant to the water tank body 55 through the water injection pipe 56, the coolant must first flow through the filter assembly 57, where impurities are trapped outside the filter layer, and clean liquid enters the water tank body 55.

[0041] To filter the coolant, refer to Figure 7 In a preferred embodiment, the filter assembly 57 includes a pump body 571, a water suction pipe 572, a filter ball 573 and a hose 574. The inlet of the water suction pipe 572 extends into the seawater, the filter ball 573 floats in the water suction pipe 572, the outlet of the filter ball 573 is connected to the inlet of the hose 574, the outlet of the hose 574 is connected to the inlet of the pump body 571, and the outlet of the pump body 571 is connected to the inlet of the water injection pipe 56.

[0042] During operation, pump 571 is activated, drawing seawater in through suction pipe 572. The water passes through filter ball 573 and hose 574, then enters pump 571. Finally, it is pressed into heat sink 54 through inlet pipe 56. Filter ball 573 floats within suction pipe 572, buoyant with the flow of seawater. As seawater flows upward from the bottom of suction pipe 572, filter ball 573 is suspended in the water due to buoyancy, where the filter screen on its surface intercepts suspended matter. Particles in the seawater collide with the surface of filter ball 573, where they are trapped by the screen. The filtered seawater then flows through the outlet of filter ball 573 and into hose 574. The spherical structure of filter ball 573 allows it to rotate continuously in the water flow, preventing blockage in a single location and achieving dynamic filtration. The filter ball 573 continuously floats in the water flow and gently collides with the walls of suction pipe 572, causing particles adhering to the screen to fall off due to vibration.

[0043] To improve the cleanliness of filter ball 573, please refer to Figure 7 In a preferred embodiment, the filter assembly 57 also includes a plurality of mudguards 575 and scrapers 576. The plurality of mudguards 575 are arranged at intervals along the height direction of the suction pipe 572. The mudguards 575 are tilted upward. The filter balls 573 are located between the plurality of baffles. The plurality of scrapers 576 are arranged in sequence along the length direction of the mudguards 575.

[0044] During use, the fender 575 first settles heavy impurities through the inclined surface, the filter ball 573 filters suspended particles, and the scraper 576 cleans the filter ball 573 in real time. The mud and sand in the seawater are first intercepted and settled by the fender 575, and the unsettled fine particles are captured by the filter ball 573. The impurities attached to the filter ball 573 are then scraped off by the scraper 576 and sink to the bottom of the suction pipe 572 with the water flow, and are finally discharged through backwash when the pump body 571 is shut down.

[0045] In order to better understand the present invention, the following Figure 1 - Figure 7 The working principle of the technical solution of the present invention, a cooling system for an explosion-proof diesel engine 2, is described in detail: A water pump 4 acts as a power source, driving the coolant to flow in two directions: one portion enters the heat exchanger 3 through the water inlet 32 ​​of the heat exchanger 3, and the other portion enters the external water channel 12 of the water-cooling tube 1 through the inlet of the external water channel 12. After initially cooling the exhaust gas, the coolant in the external water channel 12 flows to the radiator 5. After absorbing the heat from the exhaust gas, the coolant in the heat exchanger 3 also flows to the radiator 5. The radiator 5 dissipates heat from the heated coolant, which then flows back to the inlet of the water pump 4, completing the circulation. The exhaust gas from the diesel engine 2 first enters the internal air channel 11 of the water-cooling tube 1. The coolant in the external water channel 12 exchanges heat with the exhaust gas from the internal air channel 11, achieving initial cooling. After the initial cooling, the exhaust gas enters the heat exchanger 3, undergoing a secondary heat exchange with the coolant within the heat exchanger 3. The cooled exhaust gas is finally discharged, and the coolant remains in circulation within the system.

[0046] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An explosion-proof diesel engine cooling system, characterized in that: include: A water cooling pipe, wherein the water cooling pipe is provided with an inner air channel and an outer water channel, wherein the inlet of the inner air channel is connected to the exhaust pipe of the diesel engine, and the outer water channel is coaxially sleeved on the outer side of the inner air channel; a heat exchanger, wherein an air inlet of the heat exchanger is connected to an outlet of the inner air duct; a water pump, wherein a first outlet of the water pump is connected to the water inlet of the heat exchanger, and a second outlet of the water pump is connected to the inlet of the external water channel; and The radiator, the outlet of the external water channel is connected to the inlet of the radiator, the water outlet of the heat exchanger is connected to the inlet of the radiator, and the outlet of the radiator is connected to the inlet of the water pump.

2. The explosion-proof diesel engine cooling system according to claim 1, characterized in that: The water cooling pipe also includes a double-layer corrugated pipe, which is located in the middle of the water cooling pipe. Both ends of the double-layer corrugated pipe are connected to the water cooling pipe. The double-layer corrugated pipe is used to slow down the vibration transmission of the diesel engine.

3. The explosion-proof diesel engine cooling system according to claim 2, characterized in that: The length of the double-layer corrugated pipe is greater than or equal to 200 mm.

4. The explosion-proof diesel engine cooling system according to claim 1, characterized in that: The water cooling pipe further comprises a reducing pipe, the inlet of the reducing pipe is communicated with the exhaust pipe of the diesel engine, and the outlet of the reducing pipe is communicated with the inlet of the water cooling pipe.

5. The explosion-proof diesel engine cooling system according to claim 1, characterized in that: The heat exchanger further comprises a flame arrester which is mounted on the air outlet of the heat exchanger.

6. The explosion-proof diesel engine cooling system according to claim 1, characterized in that: The radiator includes a frame, a motor, a fan and a heat dissipation water tank. The motor and the heat dissipation water tank are both installed on the frame. The fan is installed on the output shaft of the motor. The fan faces the heat dissipation water tank. The outlet of the external water channel is connected to the inlet of the heat dissipation water tank, and the outlet of the heat dissipation water tank is connected to the inlet of the water pump.

7. The explosion-proof diesel engine cooling system according to claim 1, characterized in that: The cooling system further includes a temperature monitoring mechanism, which includes a controller and an exhaust temperature sensor. The exhaust temperature sensor is installed on the air outlet of the heat exchanger, and the controller is electrically connected to the exhaust temperature sensor, the water pump and the fan.

8. The explosion-proof diesel engine cooling system according to claim 6, characterized in that: The heat dissipation water tank includes a water tank body, a water injection pipe and a filter assembly. The water injection pipe is connected to the water tank body. The filter assembly is arranged on the water injection pipe. The filter assembly is used to filter impurities in the coolant to be added to the water tank body.

9. The explosion-proof diesel engine cooling system according to claim 8, characterized in that: The filter assembly includes a pump body, a water suction pipe, a filter ball and a hose. The inlet of the water suction pipe extends into the seawater, the filter ball floats in the water suction pipe, the outlet of the filter ball is connected to the inlet of the hose, the outlet of the hose is connected to the inlet of the pump body, and the outlet of the pump body is connected to the inlet of the water injection pipe.

10. The explosion-proof diesel engine cooling system according to claim 9, characterized in that: The filter assembly also includes multiple mudguards and scrapers. The multiple mudguards are arranged at intervals along the height direction of the water suction pipe. The mudguards are inclined upward. The filter balls are located between the multiple baffles. The multiple scrapers are arranged in sequence along the length direction of the mudguards.

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